Induction train control apparatus



INDUCTION TRAIN CONTROL APPARATUS Original Filed Aug. 21, 1928 QwwntozPatented Sept. 6, 1932 DANIEL HERBERT "SCHWEYER, OF EASTON; TPENNSYLVANIA" mnUcT IoN TBA-11v CONTROL APPARATUS Original applicationfi1ed..'August '21, 1928, Serial No. 301,021, now Patent 1,801,882,Apri1""21,1'93 1.

Divided and 'thisapplicationjfiled Gctober 24, 1930. Serial No.249;9'92.v V

The present invention relates to inductive train control apparatus, andaims to provide novel and improved means for inductively transmittingvarious controlling"conditions from the trackside to a'train'or vehicletr av-.

elling thereover, the improvements being-particularly intended forcontinuous control although being useful also for intermittent control.p 7 Another object of the invention is the provision of a method orapparatus of the character indicatedby means of which a variety ofdifferent vehicle controlling conditions may be employed and inusing'the two 'traflic rails of a railroad track with the same frequencyof induced current "to obtain various different vehiclecontrolling-conditions.

A further'obj'ect of the invention isfthe provision of an apparatus ofthe nature in- 519 dicated which is simple in construotionand efficientin 1 operation, Without involvingcomplicated devices that are apttocause trouble. A particular object of the invention resides in the useof a rectified A. C.' closed track'circuit with a depen'ding coil on'thevehicle in inductive relation to each rail, a rectifier and an electrontube being connected '-'in circuit with each coil-so as to"sele'ctively'operate -a translating device by the direction otthe'cu-rrent in thetrack rails. I i

It is also an object of the invention toprovide inductive train controlapparatus which is notapt tobe disturbed bystray currents in the traflicrailsq V The present application is adivision'o'f my prior copending'application; Serial No. 301 021; filed Aug.' 21,-1928, new Patent 'No.11,801,882, April 21, 1931. p A v With -the fo'regoing andother'objects' in view, which will be apparent asthe invention is .morefullyunderstoodptheinvention resides'in the method and apparatus ashere-. 'ina'i 'ter described and claimed, itbeingnoted 5 invention forthree vehicle condition control.

that changes can be'made Within the scope of t TReferring-to'thedrawingithereisshown a form of apparatus for-three conditionficone trol,embodying solenoids or translating :de-

vices A and B. When thesoleneiid A isenergized same will indicate orproduce clear conditions in the vehicle equipment whenit he solenoid Bis energized with lthesolenoi'd A deenergized, same'will-"ind'ic'ateorlproduce caution conditions;whereas*wheniboth'solenoids aredeenergized same will iindicate or c0 produce danger conditions,

The solenoids A andB 'areco'n't'rolled by Siamese twin relays 1 and '2whose switches 5 and 8 are unitedso' astoalternately engage their frontcontacts. The'svvitch 5 "is :in a

circuit 17 with the solenoid Af battery-"62 or other source ofelectrical current, switch -63 and its front contact" 64 connected:tofthe switches 5and'8.f The switch 8 is i'n'a circuit '18 with thesolenoid Bghwttmy 62 switch 63 and contactfi l'. The =switch' 63'israised against its "contact 64 when either-of themelays l and 2 isenergized, "and the' "circuits-17 and 18 "are alternately' closed, bothcircuits beingopened at'the contact 6 l' vvhen both relays are'deen'ergized so'*as"torelea'se' the switch 63. The-relays 1 and 2 areconnected in the plate circuits 25 and "26; respectively; with 1 I theaudion tubes 29 and 30, 'andt he grid-circuits 33'and 34 of said tubesinclude thereceiving coils 37 and '38, respectively, which cooperatewith the respective'rails '41 and 42.

As shown, the circuits 33 and34'have crystal I or other rectifier-s 65to permit the pulsating 35 I current to flow in one directionintadh-circuit but not in-the opposite direction, to i'as's'ist'ithetubes '29 and 30 "in their*polarize'd selection of current. 7

Electric lamps cc; 67tand"fi8'are provrded for clear, caution and dangermonditionspbeing preferably colored green, yellow'and refd respectively.The lamps are connecteditov the conditions; The lamp 67 is connected bya 1% v conductor 7 2 with the circuit 18 between the switch 8 andsolenoid B, so that said lamp is in parallel with the solenoid B to belighted when said solenoid is energized for controlling the air brakesfor caution conditions. The lamp 68 is connected by a conductor 7 3 witha back contact 74 for the switch 63, so

that when the relays 1 and 2 are deenergized, I

the switch 63 movingagainst the contact 74, will close the circuitincluding the battery 62, conductor 69, lamp 68, conductor 73, contact74 and switch 63, thereby lighting the lamp 68. a

' A singletrackside circuit is employed, using both rails 41 and 42. Apolarized relay 75 is provided that is suitably controlled by trafiic inthe blocks ahead, and wires 43 and '44 ar connected to the rails 41 and42, respectively, at the exit end of the block. The wires 43 and 44 areconnected through a reversing switch device withone-half wave rectifier59 which is connected to the secondary of a transformer, having theprimary 61v supplied with suitable alternating current. The wire 43 isconnected with a contact 53, and the wire 44 is connected with contacts51 and 52, with which the reversing switches 45 and 46 cooperate, andsaid switches are-connected with the front contacts 76 and 77 ofswitches 78 and'7 9 which are connected with the rectifier 59. Theswitches 45, 46, 7 8 and 79 are part of the relay 75, the switches 78and 7 9 being moved against their front contacts when the relay isenergized, and the switches 45 and 46 being moved to reversed positionswhen the relay is energized by current flowing in respectively oppositedirections therethrough. v

For clear conditions, with current flowing through the, relay 75 in onedirection,'the switches 45 and 46 are moved toward the left against thecontacts 51 and 53, respectively, thereby connecting the rectifier 59 orsource of pulsatingdirect current with the rails 41 and 42 so that thewaves flow in the direction of the arrows in'opposite directions in therails, as seenfin the drawing, the trucks of the train or vehiclebridging the rails 41 and 42 to complete the circuit. The pulsatingdirect current in the track rails, as shown, induces in the coil37 acurrent which is of the proper sign to pass the rectifier to energizethe tube 29 :but the current induced in coil 38 is not of proper sign topass rectifier 65 and the tube 30 is not energized, so that the relay 1isenergized to move the switch 5 against its front contact, while relay2 is deenergized thereby closing the circuit of the solenoid A and lamp66. Y V

. When current flows through the relay in the opposite direction, theswitches 45and 46 will be moved toward the right against the contacts 53and52, respectively, and the pulsating current will flow in the oppositedirection in the rails 41 and 42, thereby energizing the tube 30 throughrectifier 65 but not the tube 29 as the current in coil 37 is not ofproper sign to pass rectifier 65, so that the relay 2 is energized tomove the switch 8 against its front contact while relay 1 isdeenergized, thereby opening the switch 5. The solenoid B andlamp 67 aretherefore energized for caution condition When the relay 75 isdeenergized, the switches 45 and 46 move to neutral position, and theswitches 78 and 79 are released, so as to open the trackside circuit,and both relays 1 and 2 and solenoids A-and B will be deenergized. Theswitch 63 is therefore released and will close the circuit of the dangerlamp 68.

The pulsating current flowing in either rail is polarized, and therelation'of the receiving coils with the rails and the audion tubes issuch as to selectively excite the audion tubes. Thus, when pulsatingcurrent of one polarity flows in the'rail 41 it is induced through thecoils 37 and 38 into the respective circuits 33 and 34. However, theflow of pul sating currents in said circuits is reversed with referenceto the audion tubes 29 and 30, the flow of current in one tube beingfrom the grid to the filament and in the other tube from the filament tothe grid, it being understood that the flow in one direction only beingeffective to excite either tube-to increase the flow in the platecircuit. When the pulsating direct currentflows in the oppositedirection in the rail 41, the flow of pulsating direct currents in thecircuits 33 and 34 is reversed accordingly, and the other tube,

either 29 or 30, will be excited. I There are various types of theparticular polarized pulsating current desired, including piezo-electriccrystals, and what are known as twin magneto-striction os cillators.

Having thus described the invention, what i connected with said supplyand having a secondary circuit with a rectifier connected therein, meansincluding said rectifier for energizing said track circuit withpulsating current from sa1d secondary clrcuit, an independent inductivereceiver for each rail of rectifiers and other devices which may be usedfor selecting 1 7 said track circuit, a rectifier, an amplifier and arelay connected in circuit with each receiver and a translating deviceselectively controlled by said relays.

2. In a train controlling system, the combination, a track circuitincluding both rails r of the track, an A. C. supply, a transformerconnected with said supply and having a secondary circuit with a'rectifier connected therein, means mcludmg sa1d rectifierfor enof thetrack, an A. C. supply, a transformer connected with said supply andhaving a 2 secondary circuit with a rectifier connected therein, meansincluding said rectifier for energizing said track circuit withpulsating current from said secondary circuit, an independent receivingcoil for each rail of said track circuit, an electron amplifier and arectifier for each receiving coil and said coil connected in series withsaid rectifier and the grid of said amplifier, a relay connected in theoutput circuit of each amplifier, said relays being selectivelycontrolled from said track circuit so that when either relay isenergized the other one is deenergized and a translating devicecontrolled by said relays.

4. In a train controlling system, the combination, a track circuitincluding both rails of the track, an A. C. supply, a transformerconnected with said supply and having a seconda-ry circuit with arectifier connected therein, means including said rectifier forenergizing said track circuit with pulsating current from said secondarycircuit, means for controlling the relative direction of the flow ofcurrent in said rails, an independent receiving coil for each rail ofsaid track circuit, an electron amplifier and a rectifier for eachreceiving coil, said coil connected in series with said rectifier andthe grid of said amplifier, a relay connected in the output circuit ofeach amplifier and a translating device selectively controlled by saidrelays in response to the direction of the current in said rails. r

In testimony whereof I hereunto afiix my signature.

DANIEL HERBERT SCHVVEYER.

